day3 - Context Free # 1 Leftmost versus rightmost...

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10/4/11 Dec 2, © UCF (Charles E. 11 Context Free # 1 Leftmost versus rightmost derivations. Parse trees, A-trees. Definition of a parse tree and proof that A =>* X iff there exists an A-tree with X as its yield. Ambiguity and leftmost (rightmost) derivations. Pushdown automata; various notions of acceptance and their equivalences Push down languages and their equivalence to CFLs. Parsing Techniques: LL (top down) and LR (bottom up) parsers
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10/4/11 Dec 2, © UCF (Charles E. 22 Context Free # 2 Reduced grammars. Keep non-terminal A iff A =>* w for some terminal string w. Keep symbol X iff S =>* WXY for some strings W and Y. Lamba rule removal. Chain (unit) rule removal. Chomsky Normal Form. Left recursion removal. Greibach Normal Form.
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Dec 2, © UCF (Charles E. 33 Context Free # 3 Pumping Lemmas for CFLs. Closure of CFLs: Union, concat, *, reversal, substitution, homomorphism and inverse homomorphism, INIT, LAST, MID,
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day3 - Context Free # 1 Leftmost versus rightmost...

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